Received: from sog-mx-2.v43.ch3.sourceforge.com ([172.29.43.192] helo=mx.sourceforge.net) by sfs-ml-1.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from <kalle@rosenbaum.se>) id 1Z1HSg-0000WK-9P for bitcoin-development@lists.sourceforge.net; Sat, 06 Jun 2015 17:00:46 +0000 X-ACL-Warn: Received: from mail-qk0-f179.google.com ([209.85.220.179]) by sog-mx-2.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128) (Exim 4.76) id 1Z1HSf-0001F3-De for bitcoin-development@lists.sourceforge.net; Sat, 06 Jun 2015 17:00:46 +0000 Received: by qkoo18 with SMTP id o18so56604742qko.1 for <bitcoin-development@lists.sourceforge.net>; Sat, 06 Jun 2015 10:00:40 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=kfbWwRIhX+MGoji7L3EM38cJF/Yvyb3trEZ5LSvOoDY=; b=R18QrFFurfX5xdkTBTx4O1O8lat/qIs8CwET+sqB79zDTJWTxje0F4XACtiNw2TRDg /6b3lMljoHBA4zvTtOpVutmUvjeNh1/fPjJrsTt/uatlo03XK/Oj8WAAeF2e9k0SN00/ xsh3tn4POm01glPac3O6Yt7azbitmyF8uM8i7ntAeRCfLsa3I5o/H4RFSAha12zaYPHM Etdb6Q0t+P1bmqPYPrwtK03xdDB1jOYIcIpntCa1A8TE1Vpv+qs3Guvt2L0yJOdeGOi6 HwSgMrO9NkPD9cFSyEZIchrgfsDejC381j0MZXTROS+Or3KSBne71CFKaiUTKFQR9FV0 flRg== X-Gm-Message-State: ALoCoQkERZ+RV/qW+/3dDZ+MWgV7NfYihr6VRGvdKtFg5+/FmIjBt1gCmxMv3OEgqMOSZkQ0tKbz MIME-Version: 1.0 X-Received: by 10.140.80.170 with SMTP id c39mr10466950qgd.55.1433610040034; Sat, 06 Jun 2015 10:00:40 -0700 (PDT) Received: by 10.96.145.9 with HTTP; Sat, 6 Jun 2015 10:00:39 -0700 (PDT) In-Reply-To: <CALJP9GCBJiofY7k2RJ460CuLuWQunHcx7EcLi1-d07v76Y-E2g@mail.gmail.com> References: <CAPswA9w5Sgg6AV=9Pqx5sqbkdrwv9LmwoxmMu7xZsQSNXtmZnQ@mail.gmail.com> <CAPg+sBjtovFpLoibpVGLsNJXexBcoiYzjrvctraXntCUZBJsGg@mail.gmail.com> <CAPswA9zhB4GV=JJ28RRLFNrkVwExUv36zujmuAjwPd6rG6rvzQ@mail.gmail.com> <CALJP9GCBJiofY7k2RJ460CuLuWQunHcx7EcLi1-d07v76Y-E2g@mail.gmail.com> Date: Sat, 6 Jun 2015 19:00:39 +0200 Message-ID: <CAPswA9wqdbU0z8ydBt+9M0iQX0VSi1ce=dg3fR2_2bx3-vEqzA@mail.gmail.com> From: Kalle Rosenbaum <kalle@rosenbaum.se> To: Tom Harding <tomh@thinlink.com> Content-Type: text/plain; charset=UTF-8 X-Spam-Score: 0.2 (/) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. 0.2 AWL AWL: Adjusted score from AWL reputation of From: address X-Headers-End: 1Z1HSf-0001F3-De Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net> Subject: Re: [Bitcoin-development] BIP for Proof of Payment X-BeenThere: bitcoin-development@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: <bitcoin-development.lists.sourceforge.net> List-Unsubscribe: <https://lists.sourceforge.net/lists/listinfo/bitcoin-development>, <mailto:bitcoin-development-request@lists.sourceforge.net?subject=unsubscribe> List-Archive: <http://sourceforge.net/mailarchive/forum.php?forum_name=bitcoin-development> List-Post: <mailto:bitcoin-development@lists.sourceforge.net> List-Help: <mailto:bitcoin-development-request@lists.sourceforge.net?subject=help> List-Subscribe: <https://lists.sourceforge.net/lists/listinfo/bitcoin-development>, <mailto:bitcoin-development-request@lists.sourceforge.net?subject=subscribe> X-List-Received-Date: Sat, 06 Jun 2015 17:00:46 -0000 2015-06-06 18:10 GMT+02:00 Tom Harding <tomh@thinlink.com>: > On Jun 6, 2015 8:05 AM, "Kalle Rosenbaum" <kalle@rosenbaum.se> wrote: > >> I'm open to changes here. > > I suggest: > > - Don't include any real outputs. They are redundant because the txid is > already referenced. with the nLocktime solution, the copied outputs are not needed. > > - Start the proof script, which should be invalid, with a magic constant and > include space for future expansion. This makes PoP's easy to identify and > extend. I did remore the constant (a "PoP" literal ascii encoded string) because it didn't add much. The recipient will expect a pop, so it will simply treat it as one. I did add a 2 byte version field to make it extendable. > > - "Proof of Potential" Noted :-) Thank you /Kalle